Volkswagen ranks with GM and Toyota as one of the top-three carmakers in the world today in terms of sales volume (in units). It uses its Volkswagen brand, as well as its entire portfolio of other brands, including the luxury marques of Porsche, Audi, Bentley, Bugatti, and Lamborghini, and at the lower end, the Seat, Skoda, and Scania. What type of diversification is Volkswagen pursuing? What are the advantages and disadvantages in VW's corporate strategy?